[This is preliminary documentation and subject to change.]
The FSCTL_QUERY_FAT_BPB_BUFFER structure describes the first 36 bytes of data on a FAT16 or FAT12 volume. It is used by FSCTL_QUERY_FAT_BPB.
typedef struct _FSCTL_QUERY_FAT_BPB_BUFFER {
BYTE First0x24BytesOfBootSector[0x24];
} FSCTL_QUERY_FAT_BPB_BUFFER, *PFSCTL_QUERY_FAT_BPB_BUFFER;
Device Input and Output Overview, Device Input and Output Structures, FSCTL_QUERY_FAT_BPB